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diff --git a/var/spack/repos/builtin/packages/madgraph5amc/package.py b/var/spack/repos/builtin/packages/madgraph5amc/package.py
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+++ b/var/spack/repos/builtin/packages/madgraph5amc/package.py
@@ -0,0 +1,111 @@
+# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+import os
+
+
+class Madgraph5amc(Package):
+    """MadGraph5_aMC@NLO is a framework that aims at providing
+       all the elements necessary for SM and BSM phenomenology,
+       such as the computations of cross sections, the generation
+       of hard events and their matching with event generators,
+       and the use of a variety of tools relevant to
+       event manipulation and analysis. """
+
+    homepage = "https://launchpad.net/mg5amcnlo"
+    url      = "https://launchpad.net/mg5amcnlo/2.0/2.7.x/+download/MG5_aMC_v2.7.3.tar.gz"
+
+    version('2.7.3.py3', sha256='400c26f9b15b07baaad9bd62091ceea785c2d3a59618fdc27cad213816bc7225')
+    version('2.7.3.py2', sha256='0b665356f4d9359e6e382e0f408dc11db594734567c6b2f0ec0e0697f2dbe099',
+            url="https://launchpad.net/mg5amcnlo/2.0/2.7.x/+download/MG5_aMC_v2.7.3.tar.gz")
+
+    variant('atlas', default=False, description='Apply changes requested by ' + 
+            "the ATLAS experimenent on LHC")
+    variant('ninja', default=False, description='Use external installation' +
+            " of Ninja")
+    variant('collier', default=False, description='Use external installation' +
+            ' of Collier')
+
+    depends_on('syscalc')
+    depends_on('gosam-contrib', when='+ninja')
+    depends_on('collier', when='+collier')
+    depends_on('lhapdf')
+    depends_on('fastjet')
+    depends_on('py-six', when='@2.7.3.py3', type=('build', 'run'))
+
+    depends_on('python@:2.7.999', when='@2.7.3.py2', type=('build', 'run'))
+    conflicts('%gcc@10:', when='@2.7.3')
+
+    depends_on('python@3:', when='@2.7.3.py3', type=('build', 'run'))
+
+    patch('madgraph5amc-2.7.3.patch', level=0, when='@2.7.3.py2~atlas')
+    patch('madgraph5amc-2.7.3.atlas.patch', level=0, when='@2.7.3.py2+atlas')
+    patch('madgraph5amc-2.7.3.patch', level=0, when='@2.7.3.py3~atlas')
+    patch('madgraph5amc-2.7.3.atlas.patch', level=0, when='@2.7.3.py3+atlas')
+
+    phases = ['edit', 'build', 'install']
+
+    def edit(self, spec, prefix):
+        def set_parameter(name, value):
+            config_files.filter('^#?[ ]*' + name + '[ ]*=.*$',
+                                name + ' = ' + value,
+                                ignore_absent=True)
+
+        config_files = FileFilter(join_path("input",
+                                            ".mg5_configuration_default.txt"),
+                                  join_path("input", "mg5_configuration.txt"))
+
+        set_parameter('syscalc_path', spec['syscalc'].prefix.bin)
+
+        if '+ninja' in spec:
+            set_parameter('ninja', spec['gosam-contrib'].prefix)
+
+        if '+collier' in spec:
+            set_parameter('collier', spec['collier'].prefix)
+
+        set_parameter('output_dependencies', 'internal')
+        set_parameter('lhapdf', join_path(spec['lhapdf'].prefix.bin,
+                      'lhapdf-config'))
+        set_parameter('fastjet', join_path(spec['fastjet'].prefix.bin,
+                                           'fastjet-config'))
+
+        set_parameter('automatic_html_opening', 'False')
+
+    def build(self, spec, prefix):
+        with working_dir(join_path('vendor', 'CutTools')):
+            make(parallel=False)
+
+        with working_dir(join_path('vendor', 'StdHEP')):
+            make(parallel=False)
+
+        if '+atlas' in spec:
+            if os.path.exists(join_path('bin', 'compile.py')):
+                compile_py = Executable(join_path('bin', 'compile.py'))
+            else:
+                compile_py = Executable(join_path('bin', '.compile.py'))
+
+            compile_py()
+
+    def install(self, spec, prefix):
+        def installdir(dirname):
+            install_tree(dirname, join_path(prefix, dirname))
+
+        def installfile(filename):
+            install(filename, join_path(prefix, filename))
+
+        for p in os.listdir(self.stage.source_path):
+            if os.path.isdir(p):
+                installdir(p)
+            else:
+                if p != 'doc.tgz':
+                    installfile(p)
+                else:
+                    mkdirp(prefix.share)
+                    install(p, join_path(prefix.share, p))
+
+        install(join_path('Template', 'LO', 'Source', '.make_opts'),
+                join_path(prefix, 'Template', 'LO',
+                          'Source', 'make_opts'))